• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Rattle noise at 4700 RPM

  • Thread starter Thread starter skm599
  • Start date Start date
S

skm599

Guest
Hi there,

I have a 1981 GS550T that has recently started making rattling noises coming from the engine area. It occurs when I have the bike around 4700 RPMs. The bike vibrates at this particular point and I can clearly hear the rattle. However once I increase the RPMs to 5000 the sounds goes away. It also is not present below 4700 RPM. This happens in neutral or while riding. It also does not matter if I am accelerating or slowing down. Usually when it passes through 47000 RPMs I will hear a little rattle for a second. Occasionally I won't hear anything and the bike will be quiet. However that seems to be becoming more rare. I checked for loose covers and screws and tightened everything down. This has not helped with the noise.

THe bike shows no noticable decline in performance. Actually it runs great. Could this be a valve issue? I did quite a bit of searching and found references in the forum to valve clearance issues but no one as mentioned their noise being dependent on RPMs. So I thought I would ask. Am I endanger of damaging the bike by continuing to ride it? I'd appreciate any info anyone has.
Thanks!

skm599
 
You might want to check your cam chain tensioner. If it's not working properly you may have extra slack in the chain which is hitting a resonant frequence at 4700 rpm thus the noise.
 
Hey, has anyone mentioned checking the cam chain? :lol: :p

I'd be more inclined to think there might be loose baffles in the exhaust somewhere. You can also get some interesting noises if one of the engine mount bolts is a little loose.
 
Thanks for all the responses! I'll check the cam tensions and report my results.
 
You must log in or register to reply here.

Similar threads

D
GS550 Bottom End Rattle/Knock
Replies
15
Views
222
dgates1
dgates1
F
Engine Knock
Replies
19
Views
179
DimitriT
DimitriT
F
GS550L TSCC Ticking
Replies
8
Views
106
FlaminFiero
F
D
GS 750 1982 stuttering on acceleration *Sometimes*
Replies
4
Views
75
Duodecillion
D
ShawnR
1981 GS550 - Bogging at WOT and I'm stumped.
Replies
18
Views
181
jprice90
J
Back
Top